What is the average mpg owners of the Jeep Liberty with 3.7L engine and auto are getting in combined city and highway? I have a new Liberty with a very rough idle, although cruising it seems OK, but the fuel economy is poor with an average of only 17.1 mpg. This is with my wife driving and is approximately 70% highway and 30% city. She is not a lead foot driver.

I know it's not an economy car, but the window sticker had 17 city and 22 highway, and it averages right at the city#. I had a 2001 Dodge Dakota with 3.92 rear gear , 5-speed and the 4.7L engine an I averaged 2 mpg better than the 3.7L 2WD Liberty.

I am getting 16.2 average and that 100% in town driving. My Jeep doesn't see much other than local stop and go driving. I didn't buy it for fuel economy but I do thinik they should do better for having a 6 cylinder engine.

What is the average mpg owners of the Jeep Liberty with 3.7L engine and auto are getting in combined city and highway? I have a new Liberty with a very rough idle, although cruising it seems OK, but the fuel economy is poor with an average of only 17.1 mpg. This is with my wife driving and is approximately 70% highway and 30% city. She is not a lead foot driver.

My experience with Jeeps is that they do idle rough until they get broke in.Both my TJ and the wife's KJ seemed to idle rough at first but are fine now.As for mileage...they both suck for fuel economy. I was just looking at getting a 2005 Mustang GT next spring...300 HP with 19/27 mpg out of a V-8. Now if Ford can do that why doesn't DC do something. Gas isn't getting any cheaper and neither is my commute to work,lol

My Liberty with 3.7L gets almost exactly what they said on the manufacturer's sticker....18 in town, 25mpg on the highway. If you drive on the freeway and keep your speed 65mph or below..your gas mileage goes way up. I've had it almost to 30mpg by keeping the speed below 65mph.

Wow almost 30 mpg... We avg. 17 on a good week. The hwy speed limit around here is 70 and most people don't think too kindy to people doing 65. Is it the gear ratio that is causing the Liberty to get low mpg? Does anyone have any mods that have squeezed out a few more mpg's?

I generally get 20.5 - 21.5 highway. In the city I get about 17 - 17.5. For some reason, though, when I leave the Liberty with the wife, she tends to get about 15 - 16 city. I guess she drives with a less subtle foot?

By the way, I read somewhere that the Liberty gets pretty much the same gas mileage as the Cherokee used to. The Liberty however, is heavier than the Cherokee (not sure of the numbers - I haven't really looked them up.) If that is the case, then in reality, in order to squeeze the same gas mileage out of the heavier Liberty as they did out of the Cherokee, then DC actually did improve their gas mileage.

To end users like us, it doesn't seem like much of a difference. But imagine what the mileage would be if they hadn't made improvements to compensate for the weight.

I'll guarantee you'll get way better gas mileage keeping it at, or under 65mph. I have the 3.7L with the automatic, and saw a HUGE increase in gas mileage keeping it under 65. Just stay in the right hand lane so as not to piss off too many people. Sit back and enjoy the ride. Everybody's in such a damn hurry these days......The speed limit here on the freeway is 70 also...way too fast for roads that see sub par maintenance.